(Reuters) - Pennsylvania police did not dispute local media reports on Monday that said the man who shot and killed four people at a car wash outside Pittsburgh on Sunday was a jealous former lover of one of the women killed.

Timothy Smith, who police say used a semi-automatic rifle and a handgun in his attack, had dated one of his alleged victims, Chelsie Cline, the Pittsburgh Post-Gazette and other local news outlets reported, citing interviews with victims' relatives.

Timothy Smith, 28, waited at a car wash wearing a ballistic vest and armed with an AR-15 rifle and ambushed his ex-girlfriend, killing her, her brother and two other people in Melcroft, Pennsylvania, just days after they broke up, police and family say: https://t.co/ZGcraRsyAcpic.twitter.com/qkNIAIXgRb

Smith, 28, was on life support at a nearby hospital on Monday, where he was being treated for what police said was a possible self-inflicted gunshot to the head, Pennsylvania State Police spokesman Robert Broadwater said. Earlier police reports that said Smith had died in the attack were incorrect, he said.

Broadwater did not dispute, but could not confirm, local media reports about the relationship between Smith and his alleged victims.

"We understand what the family and friends are saying, they probably know more than we do," Broadwater said. "I'm sure it will be confirmed."

Photos from the scene:

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Multiple people killed, injured in shooting at Pennsylvania car wash

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Multiple people killed, injured in shooting at Pennsylvania car wash

MELCROFT, PA - JANUARY 28: Randy Baldwin of Melcroft sits in his truck across the street from Ed's Car Wash where five people were found dead and one injured after a shooting early Sunday morning, January 28, 2018 in Melcroft, Pennsylvania. Police are trying to determine if the shooter was among those found at the scene. (Photo by Justin Merriman/Getty Images)

MELCROFT, PA - JANUARY 28: Ryan Green talks to a detective near the scene of a shooting that left 5 dead and one injured outside of Ed's Car Wash on January 28, 2018 in Melcroft, Pennsylvania. The shooting occurred shortly before 3 a.m. and police are trying to determine if the shooter was among those found at the scene. Green's girlfriend, Sierra Kolarik is the sister of one of the victims. (Photo by Justin Merriman/Getty Images)

MELCROFT, PA - JANUARY 28: Two women walk near the scene of a shooting that left 5 dead and one injured outside of Ed's Car Wash on January 28, 2018 in Melcroft, Pennsylvania. The shooting occurred shortly before 3 a.m. and police are trying to determine if the shooter was among those found at the scene. (Photo by Justin Merriman/Getty Images)

MELCROFT, PA - JANUARY 28: A man rides a golf cart past Ed's Car Wash where five people were found dead and one injured after a shooting on January 28, 2018 in Melcroft, Pennsylvania. The shooting occurred shortly before 3 a.m. and police are trying to determine if the shooter was among those found at the scene. (Photo by Justin Merriman/Getty Images)

MELCROFT, PA - JANUARY 28: A truck sits near near Ed's Car Wash where five people were found dead and one injured after a shooting early Sunday morning, January 28, 2018 in Melcroft, Pennsylvania. Police are trying to determine if the shooter was among those found at the scene. (Photo by Justin Merriman/Getty Images)

MELCROFT, PA - JANUARY 28: Street signs mark the intersection near Ed's Car Wash where five people were found dead and one injured after a shooting early Sunday morning, January 28, 2018 in Melcroft, Pennsylvania. Police are trying to determine if the shooter was among those found at the scene. (Photo by Justin Merriman/Getty Images)

MELCROFT, PA - JANUARY 28: Street signs mark the intersection near Ed's Car Wash where five people were found dead and one injured after a shooting early Sunday morning, January 28, 2018 in Melcroft, Pennsylvania. Police are trying to determine if the shooter was among those found at the scene. (Photo by Justin Merriman/Getty Images)

MELCROFT, PA - JANUARY 28: Randy Baldwin of Melcroft sits in his truck across the street from Ed's Car Wash where five people were found dead and one injured after a shooting early Sunday morning, January 28, 2018 in Melcroft, Pennsylvania. Police are trying to determine if the shooter was among those found at the scene. (Photo by Justin Merriman/Getty Images)

MELCROFT, PA - JANUARY 28: Family members and friends console each other near Ed's Car Wash where five people were found dead and one injured after a shooting early Sunday morning on January 28, 2018 in Melcroft, Pennsylvania. Police are trying to determine if the shooter was among those found at the scene. (Photo by Justin Merriman/Getty Images)

MELCROFT, PA - JANUARY 28: Ed's Car Wash sits quiet after police cleared the scene where five people were found dead and one injured after a shooting early Sunday morning, January 28, 2018 in Melcroft, Pennsylvania. Police are trying to determine if the shooter was among those found at the scene. (Photo by Justin Merriman/Getty Images)

MELCROFT, PA - JANUARY 28: People comfort each other as they walk from Ed's Car Wash where five people were found dead and one injured after a shooting early Sunday morning, January 28, 2018 in Melcroft, Pennsylvania. Police are trying to determine if the shooter was among those found at the scene. (Photo by Justin Merriman/Getty Images)

MELCROFT, PA - JANUARY 28: Sierra Kolarik, the sister of Chelsie Cline, one of the victims in a mass shooting at Ed's Car Wash early Sunday morning, is comforted on January 28, 2018 in Melcroft, Pennsylvania. Five people were found dead and one injured in the shooting. Police are trying to determine if the shooter was among those found at the scene. (Photo by Justin Merriman/Getty Images)

MELCROFT, PA - JANUARY 28: Sierra Kolarik, the sister of Chelsie Cline, one of the victims in a mass shooting at Ed's Car Wash, walks from the scene with her boyfriend, Ryan Green on January 28, 2018 in Melcroft, Pennsylvania. Five people were found dead and one injured in the shooting. Police are trying to determine if the shooter was among those found at the scene. (Photo by Justin Merriman/Getty Images)

MELCROFT, PA - JANUARY 28: A man washes his truck at Ed's Car Wash as police tape lays piled in the dumpster on January 28, 2018 in Melcroft, Pennsylvania. Five people were found dead and one injured in a shooting at the carwash. Police are trying to determine if the shooter was among those found at the scene. (Photo by Justin Merriman/Getty Images)